<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function copy(obj) {
            if (typeof obj != 'object') return
            var res = obj instanceof Array ? [] : {};
            for (var key in obj) {
                res[key] = obj[key]
            }
            return res
        }
    </script>
</body>

</html>